I get that it's importnant, but I would like to know why do runners do it exactly, because it would help me a lot with doing the run better. Thank you and have a great day!!

Currently looking at it- It seems like it's being used to skip dialogue, I am not sure though.

Great question :) We use the quicksave and quickload for a couple of things. Much of the dialogue can be skipped with a QS/QL, as you have noticed.

It is also used in combat situations, because it resets the enemies' level of alertness. It is very useful when being chased by an enemy patrol car, because the enemies need a moment to lock onto you after a QL. It is especially effective at nighttime, and you can often lose the enemies' aggro.

It is also used for it's intended purpose for the trickshots. If you miss a trickshot, it is normally best to quickload rather than shoot another shot, because you generally do not have a lot of ammo/weapon durability to waste.

Thank you very much for the answer, I did not know that QS and QLing resets the enemies' level of alert. It is also obvious with the trickshots, but I'm still optimizing a bit of the early game route and still didn't get to learning the trickshots.

Thank you very much for the answer, and I wish you all the best!!